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Help me for spirit grammar definition! It is simple...
by 钱晓明 11 Apr '08

11 Apr '08

I want to use spirit parsing some text file. The very basic element in those files is string, float and int. For example: 123L "hello" 987.4343 I wrote my grammar class: struct pm_parser : public grammar<pm_parser> { template <typename ScannerT> struct definition { definition(pm_parser const& self) { factor = int_p[show_int()]>>"L" | '"'>> *((~ch_p('"'))[show_char()]) >>'"' | real_p[show_double()] ; } rule<ScannerT> factor; rule<ScannerT> const& start() const { return factor; } }; }; show_int, show_char, show_double are structs used to show int, char and double value. When I parse 1L, it works. But when I parse 1, it is parsed twice(int_p and real_p are all works). How can I define grammar struct to parse text above without errors?

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Synchronized queue
by Yang Zhang 11 Apr '08

11 Apr '08

Hi, does boost provide a synchronized queue (or anything that is a concurrent producer-consumer abstraction)? Thanks!

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boost::algorithm + SunStudio + QuantLib
by Hicham Mouline 11 Apr '08

11 Apr '08

I extracted parts of QuantLib0.8.1 that I try to compile with CC on CC: Sun C++ 5.8 Patch 121017-13 2008/01/02 Studio11 i think The failure is in "dataparsers.cpp", line 86: Error: Could not find a match for std::string::basic_string(boost::transform_iterator<boost::algorithm::detail::to_lowerF<char>, const char*, boost::use_default, boost::use_default>, boost::transform_iterator<boost::algorithm::detail::to_lowerF<char>, const char*, boost::use_default, boost::use_default>) needed in boost::algorithm::to_lower_copy<std::string>(const std::string &, const std::locale&). the snippet from quantlib that uses this is : std::string sub = flist[i]; if (boost::algorithm::to_lower_copy(sub) == "dd") the function complained about from boost/algorithm/string/case_conv.hpp //! Convert to lower case /*! \overload */ template<typename SequenceT> inline SequenceT to_lower_copy( const SequenceT& Input, const std::locale& Loc=std::locale()) { return SequenceT( make_transform_iterator( begin(Input), detail::to_lowerF< typename value_type_of<SequenceT>::type >(Loc)), make_transform_iterator( end(Input), detail::to_lowerF< typename value_type_of<SequenceT>::type >(Loc))); } the same version of QL/boost compile ok on x86-64-linux/g++4.1 and win32-intel10 and other combinations any clues appreciated, regards,

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[iterator] Writable transform_iterator: how to?
by Nicola 11 Apr '08

11 Apr '08

Hello, I cannot figure out why the following code is wrong: #include <iostream> #include <vector> #include <functional> #include <boost/iterator/transform_iterator.hpp> struct f : public std::unary_function<int, int&> { int& operator()(int& x) { return x; } }; typedef std::vector<int> vec_type; typedef boost::transform_iterator<f, vec_type::iterator> trans_iter_type; int main() { vec_type V; V.push_back(4); trans_iter_type it(boost::make_transform_iterator(V.begin(), f())); std::cout << *it << std::endl; *it = 8; std::cout << *it << std::endl; return 0; } The compiler (g++ 4.0.1) complains about dereferencing and the error message says: error: passing ‘const f’ as ‘this’ argument of ‘int& f::operator()(int&)’ discards qualifiers Nicola

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[1.35.0][xpressive] INVALID_REGULAR_EXPRESSION - why?
by Markus Werle 11 Apr '08

11 Apr '08

Hi! The following piece of code used to compile with previous versions of boost: using namespace boost::xpressive; sregex path_delimiter = '/'; Now it bails out on VC8 SP1 with (beautified output): ------ Build started: Project: XXXX, Configuration: Release Win32 ------ Compiling... MainFrm.cpp MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/proto/matches.hpp(356) : error C2825: 'Expr': must be a class or namespace when followed by '::' MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/detail/static/grammar.hpp(317) : see reference to class template instantiation 'boost::proto::result_of::matches<Expr,Grammar>' being compiled with [ Expr=char, Grammar=boost::xpressive::Grammar<char> ] MY_PATH_TO_BOOST\boost_1_35_0\boost/mpl/if.hpp(63) : see reference to class template instantiation 'boost::xpressive::is_valid_regex<Expr,Char>' being compiled with [ Expr=char, Char=char ] MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/basic_regex.hpp(94) : see reference to class template instantiation 'boost::mpl::if_<T1,T2,T3>' being compiled with [ T1=boost::xpressive::is_valid_regex<char,char>, T2=boost::mpl::true_, T3=boost::xpressive::INVALID_REGULAR_EXPRESSION ] .\MainFrm.cpp(1514) : see reference to function template instantiation 'boost::xpressive::basic_regex<BidiIter>::basic_regex<char>(const Expr &)' being compiled with [ BidiIter=std::_String_const_iterator<char,std::char_traits<char>, std::allocator<char>>, Expr=char ] MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/proto/matches.hpp(356) : error C2143: syntax error : missing ',' before '`global namespace'::proto_base_expr' MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/proto/matches.hpp(356) : error C2977: 'boost::proto::detail::matches_impl' : too many template arguments MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/proto/matches.hpp(260) : see declaration of 'boost::proto::detail::matches_impl' MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/proto/matches.hpp(357) : error C2955: 'boost::proto::detail::matches_impl' : use of class template requires template argument list MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/proto/matches.hpp(260) : see declaration of 'boost::proto::detail::matches_impl' MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/basic_regex.hpp(94) : error C2664: 'boost::mpl::assertion_failed' : cannot convert parameter 1 from 'boost::mpl::failed ************boost::xpressive::INVALID_REGULAR_EXPRESSION::* ***********' to 'boost::mpl::assert<false>::type' No constructor could take the source type, or constructor overload resolution was ambiguous MY_PATH_TO_BOOST\boost_1_35_0\boost/xpressive/basic_regex.hpp(95) : error C2514: 'boost::xpressive::is_valid_regex<Expr,Char>' : class has no constructors with [ Expr=char, Char=char ] Build What went wrong? Changing the code to sregex path_delimiter = sregex::compile("/"); fixes the issue for me, but I missed this change in the release notes ... Markus

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Re: [Boost-users] libboost_filesystem compile error in qnx
by Ricardo Perrone 11 Apr '08

11 Apr '08

> Ricardo Perrone wrote: > > Hi, > > > > I am trying to compile/install boost libraries (1.35.0 > > version) and some erros appears in console: > > > Does anybody know how to solve this? My qcc/QCC is set > > to 3.3.5,gcc_ntox86. The same error appears when i try > > with bjam > > No but it helps if you put the library name in the title so the author is > made aware of the issue :-) > you're right :-) > Looks like a configuration issue: does QNX have the POSIX re-entrant std lib > functions such as strerror_r ? If not there's probably a macro that can set > (or maybe unset) somewhere in Boost.System to solve this. > > John. i agree with you, but considering that i am a new user and i don't have so much experience to configure appropriately, how can i check this std lib? In $BOOS_ROOT/boost/config/platform/qnxnto.hpp there are the following default informations: // QNX specific config options: #define BOOST_PLATFORM "QNX" #define BOOST_HAS_UNISTD_H #include <boost/config/posix_features.hpp> // QNX claims XOpen version 5 compatibility, but doesn't have an nl_types.h // or log1p and expm1: #undef BOOST_HAS_NL_TYPES_H #undef BOOST_HAS_LOG1P #undef BOOST_HAS_EXPM1 #define BOOST_HAS_SCHED_YIELD #define BOOST_HAS_PTHREADS #define BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE #define BOOST_HAS_GETTIMEOFDAY #define BOOST_HAS_CLOCK_GETTIME #define BOOST_HAS_NANOSLEEP At this moment i am using QNX 6.3.2 and i don' t know what is the macro that enables the std lib functions in accordance with POSIX. Thanks Ricardo __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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[boost::function] how to parametrize? (re-send)
by Pau Garcia i Quiles 10 Apr '08

10 Apr '08

Hello, (There were some errors in the parametrized.cpp source file in my original submission, they are fixed now) I'm trying to implement something like the registerField/field methods of QWizard from Qt ( http://doc.trolltech.com/4.4beta/qwizard.html#registering-and-using-fields ) but without Qt. Long story short, what I'm trying to do is to have a list of member functions I should call to get a value from an instance of a class. There will be *hundreds* of different classes with different accessor methods (sometimes it will be called "value()", others "text()", yet in other cases it may be "isEnabled()"). Return types will also be different, but that's already solved by boost::any. I'm attaching two examples of what I want to achieve: * nonparametrized.cpp: it works fine but it's not parametrized * parametrized.cpp: it's essentially the nonparametrized.cpp code but introducing a new class called "Proxy" which has a "field" method which should receive the parameters boost::function needs. Problem is, for parametrized.cpp I cannot figure what the signature of the "field" method (line 27) should be in order to call it for different objects (see lines 48, 61 and 74). I'm not even sure I need to specify those three parameters! Can you help me? Code can be compiled against Boost 1.34.1 (not tested against 1.35.0) with: g++ -o nonparametrized nonparametrized.cpp -lboost_signals Thank you. -- Pau Garcia i Quiles http://www.elpauer.org (Due to my workload, I may need 10 days to answer)

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Re: [Boost-users] Boost.Exception
by Emil Dotchevski 10 Apr '08

10 Apr '08

I assume that it will be in the 1.36 release. Until then, you can get it from the current Boost development code at http://svn.boost.org/svn/boost/trunk/. The only thing missing from there at the moment is the new behavior of boost::throw_exception as described here: http://revergestudios.com/boost-exception/throw_exception.html. This will be added as soon as I finish working on minor compile errors and workarounds for various compilers/platforms (probably by the end of this week due to slow turnaround of the tests on some platforms.) -- Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode --------------- From: Olaf Peter <ope-devel <at> gmx.de> Subject: Boost.Exception Newsgroups: gmane.comp.lib.boost.user Date: 2008-04-10 06:08:18 GMT (15 hours and 52 minutes ago) with interest I did follow the discussion about boost.exeception some times ago. At http://www.revergestudios.com/boost-exception/boost-exception.html I read: Note: Boost Exception was accepted as a Boost library on November 7, 2007; however it has not yet been part of an official Boost release. Why is it not in release 1.35?? Is it safe to use it out of the boost distribution (concerning API changes). Thanks, Olaf

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[boost::function] how to parametrize?
by Pau Garcia i Quiles 10 Apr '08

10 Apr '08

Hello, I'm trying to implement something like the registerField/field methods of QWizard in Qt ( http://doc.trolltech.com/4.4beta/qwizard.html#registering-and-using-fields ) but without Qt. Long story short, what I'm trying to do is to have a list of member functions I should call to get a value from an instance of a class. There will be *hundreds* of different classes with different accessor methods (sometimes it will be called "value()", others "text()", yet in other cases it may be "isEnabled()"). Return types will also be different, but that's already solved by boost::any. I'm attaching two examples of what I want to achieve: * nonparametrized.cpp: it works fine but it's not parametrized, i. e. * parametrized.cpp: it's essentially the nonparametrized.cpp code but introducing a new class called "Proxy" which has a "field" method which should receive the parameters boost::function needs. Problem is, for parametrized.cpp I cannot figure what the signature of the "field" method (line 27) should be in order to call it for different objects (see lines 48, 61 and 74). I'm not even sure I need to specify those three parameters! Can you help me? Code can be compiled against Boost 1.34.1 (not tested against 1.35.0) with: g++ -o nonparametrized nonparametrized.cpp -lboost_signals Thank you. -- Pau Garcia i Quiles http://www.elpauer.org (Due to my workload, I may need 10 days to answer)

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Boost ofstream.h include
by Jeffery Cavallaro 10 Apr '08

10 Apr '08

I am just starting to use the filesystem library, so AIA if this has already been covered... It looks like filesystem/fstream.hpp is not included in filesystem.hpp in 1.35.0. In fact, it seems like it is the only include file in the filesystem subdir that doesn't get included in the by including filesystem.hpp. Was this an oversight, on purpose, or did I do something wrong? Thanks! -- Jeffery Cavallaro, 1055 Joaquin-191A Infrastructure Engineering Google Inc. 1600 Amphitheatre Parkway Mountain View, CA 94043 650-214-2552

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